case auxCCop:
		return fmt.Sprintf(" [%s]", Op(v.AuxInt))
	case auxS390XCCMask, auxS390XRotateParams:
		return fmt.Sprintf(" {%v}", v.Aux)
	case auxFlagConstant:
		return fmt.Sprintf("[%s]", flagConstant(v.AuxInt))
	case auxNone:
		return ""
	default:
		// If you see this, add a case above instead.
		return fmt.Sprintf("[auxtype=%d AuxInt=%d Aux=%v]", opcodeTable[v.Op].auxType, v.AuxInt, v.Aux)
	}
}

		// comparisons, but we don't use such a beast yet.
		// This op is for temporary use by rewrite rules. It
		// cannot appear in the generated assembly.
		{name: "FlagConstant", aux: "FlagConstant"},

		// (InvertFlags (CMP a b)) == (CMP b a)
		// InvertFlags is a pseudo-op which can't appear in assembly output.
		{name: "InvertFlags", argLength: 1}, // reverse direction of arg0

		argLen:  4,
		call:    true,
		reg: regInfo{
			inputs: []inputInfo{
				{0, 16}, // R4
				{1, 1},  // R0
				{2, 2},  // R1
			},
		},
	},
	{
		name:    "FlagConstant",
		auxType: auxFlagConstant,
		argLen:  0,
		reg:     regInfo{},
	},
	{
		name:   "InvertFlags",
		argLen: 1,
		reg:    regInfo{},
	},
	{